Orthoimagery data typically are high resolution aerial images that combine the visual attributes of an aerial photograph with the spatial accuracy and reliability of a planimetric map. USGS digital orthoimage resolution may vary from 6 inches to 1 meter. The National Map offers free downloads of public domain, 1-meter orthoimagery for the conterminous United States with many urban areas and other locations at 2-foot or finer resolution.
Data: documentation and downloads
USGS Fact Sheet: The National Map - Orthoimagery
Digital Orthoimagery Base Specification
Status & highlights
Sunset of National Map High Resolution Orthoimagery Data and Service
Other orthoimagery data resources and activities
National Digital Orthoimagery Program